drivers/scsi/libsas/sas_ata.c

   1 /*
   2  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  *
   6  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA
  22  */
  23
  24 #include <linux/scatterlist.h>
  25 #include <linux/slab.h>
  26
  27 #include <scsi/sas_ata.h>
  28 #include "sas_internal.h"
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_tcq.h>
  32 #include <scsi/scsi.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_sas.h>
  35 #include "../scsi_sas_internal.h"
  36 #include "../scsi_transport_api.h"
  37 #include <scsi/scsi_eh.h>
  38
  39 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  40 {
  41         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  42
  43         /* transport error */
  44         if (ts->resp == SAS_TASK_UNDELIVERED)
  45                 return AC_ERR_ATA_BUS;
  46
  47         /* ts->resp == SAS_TASK_COMPLETE */
  48         /* task delivered, what happened afterwards? */
  49         switch (ts->stat) {
  50                 case SAS_DEV_NO_RESPONSE:
  51                         return AC_ERR_TIMEOUT;
  52
  53                 case SAS_INTERRUPTED:
  54                 case SAS_PHY_DOWN:
  55                 case SAS_NAK_R_ERR:
  56                         return AC_ERR_ATA_BUS;
  57
  58
  59                 case SAS_DATA_UNDERRUN:
  60                         /*
  61                          * Some programs that use the taskfile interface
  62                          * (smartctl in particular) can cause underrun
  63                          * problems.  Ignore these errors, perhaps at our
  64                          * peril.
  65                          */
  66                         return 0;
  67
  68                 case SAS_DATA_OVERRUN:
  69                 case SAS_QUEUE_FULL:
  70                 case SAS_DEVICE_UNKNOWN:
  71                 case SAS_SG_ERR:
  72                         return AC_ERR_INVALID;
  73
  74                 case SAM_CHECK_COND:
  75                 case SAS_OPEN_TO:
  76                 case SAS_OPEN_REJECT:
  77                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  78                                     __func__, ts->stat);
  79                         return AC_ERR_OTHER;
  80
  81                 case SAS_ABORTED_TASK:
  82                         return AC_ERR_DEV;
  83
  84                 case SAS_PROTO_RESPONSE:
  85                         /* This means the ending_fis has the error
  86                          * value; return 0 here to collect it */
  87                         return 0;
  88                 default:
  89                         return 0;
  90         }
  91 }
  92
  93 static void sas_ata_task_done(struct sas_task *task)
  94 {
  95         struct ata_queued_cmd *qc = task->uldd_task;
  96         struct domain_device *dev;
  97         struct task_status_struct *stat = &task->task_status;
  98         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  99         struct sas_ha_struct *sas_ha;
 100         enum ata_completion_errors ac;
 101         unsigned long flags;
 102
 103         if (!qc)
 104                 goto qc_already_gone;
 105
 106         dev = qc->ap->private_data;
 107         sas_ha = dev->port->ha;
 108
 109         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 110         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) {
 111                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 112                 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 113                 dev->sata_dev.sstatus = resp->sstatus;
 114                 dev->sata_dev.serror = resp->serror;
 115                 dev->sata_dev.scontrol = resp->scontrol;
 116         } else if (stat->stat != SAM_STAT_GOOD) {
 117                 ac = sas_to_ata_err(stat);
 118                 if (ac) {
 119                         SAS_DPRINTK("%s: SAS error %x\n", __func__,
 120                                     stat->stat);
 121                         /* We saw a SAS error. Send a vague error. */
 122                         qc->err_mask = ac;
 123                         dev->sata_dev.tf.feature = 0x04; /* status err */
 124                         dev->sata_dev.tf.command = ATA_ERR;
 125                 }
 126         }
 127
 128         qc->lldd_task = NULL;
 129         if (qc->scsicmd)
 130                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 131         ata_qc_complete(qc);
 132         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 133
 134         /*
 135          * If the sas_task has an ata qc, a scsi_cmnd and the aborted
 136          * flag is set, then we must have come in via the libsas EH
 137          * functions.  When we exit this function, we need to put the
 138          * scsi_cmnd on the list of finished errors.  The ata_qc_complete
 139          * call cleans up the libata side of things but we're protected
 140          * from the scsi_cmnd going away because the scsi_cmnd is owned
 141          * by the EH, making libata's call to scsi_done a NOP.
 142          */
 143         spin_lock_irqsave(&task->task_state_lock, flags);
 144         if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
 145                 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
 146         spin_unlock_irqrestore(&task->task_state_lock, flags);
 147
 148 qc_already_gone:
 149         list_del_init(&task->list);
 150         sas_free_task(task);
 151 }
 152
 153 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 154 {
 155         int res;
 156         struct sas_task *task;
 157         struct domain_device *dev = qc->ap->private_data;
 158         struct sas_ha_struct *sas_ha = dev->port->ha;
 159         struct Scsi_Host *host = sas_ha->core.shost;
 160         struct sas_internal *i = to_sas_internal(host->transportt);
 161         struct scatterlist *sg;
 162         unsigned int xfer = 0;
 163         unsigned int si;
 164
 165         task = sas_alloc_task(GFP_ATOMIC);
 166         if (!task)
 167                 return AC_ERR_SYSTEM;
 168         task->dev = dev;
 169         task->task_proto = SAS_PROTOCOL_STP;
 170         task->task_done = sas_ata_task_done;
 171
 172         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 173             qc->tf.command == ATA_CMD_FPDMA_READ) {
 174                 /* Need to zero out the tag libata assigned us */
 175                 qc->tf.nsect = 0;
 176         }
 177
 178         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 179         task->uldd_task = qc;
 180         if (ata_is_atapi(qc->tf.protocol)) {
 181                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 182                 task->total_xfer_len = qc->nbytes;
 183                 task->num_scatter = qc->n_elem;
 184         } else {
 185                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 186                         xfer += sg->length;
 187
 188                 task->total_xfer_len = xfer;
 189                 task->num_scatter = si;
 190         }
 191
 192         task->data_dir = qc->dma_dir;
 193         task->scatter = qc->sg;
 194         task->ata_task.retry_count = 1;
 195         task->task_state_flags = SAS_TASK_STATE_PENDING;
 196         qc->lldd_task = task;
 197
 198         switch (qc->tf.protocol) {
 199         case ATA_PROT_NCQ:
 200                 task->ata_task.use_ncq = 1;
 201                 /* fall through */
 202         case ATAPI_PROT_DMA:
 203         case ATA_PROT_DMA:
 204                 task->ata_task.dma_xfer = 1;
 205                 break;
 206         }
 207
 208         if (qc->scsicmd)
 209                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 210
 211         if (sas_ha->lldd_max_execute_num < 2)
 212                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 213         else
 214                 res = sas_queue_up(task);
 215
 216         /* Examine */
 217         if (res) {
 218                 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 219
 220                 if (qc->scsicmd)
 221                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 222                 sas_free_task(task);
 223                 return AC_ERR_SYSTEM;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 230 {
 231         struct domain_device *dev = qc->ap->private_data;
 232
 233         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 234         return true;
 235 }
 236
 237 static void sas_ata_phy_reset(struct ata_port *ap)
 238 {
 239         struct domain_device *dev = ap->private_data;
 240         struct sas_internal *i =
 241                 to_sas_internal(dev->port->ha->core.shost->transportt);
 242         int res = TMF_RESP_FUNC_FAILED;
 243
 244         if (i->dft->lldd_I_T_nexus_reset)
 245                 res = i->dft->lldd_I_T_nexus_reset(dev);
 246
 247         if (res != TMF_RESP_FUNC_COMPLETE)
 248                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
 249
 250         switch (dev->sata_dev.command_set) {
 251                 case ATA_COMMAND_SET:
 252                         SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 253                         ap->link.device[0].class = ATA_DEV_ATA;
 254                         break;
 255                 case ATAPI_COMMAND_SET:
 256                         SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 257                         ap->link.device[0].class = ATA_DEV_ATAPI;
 258                         break;
 259                 default:
 260                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 261                                     __func__,
 262                                     dev->sata_dev.command_set);
 263                         ap->link.device[0].class = ATA_DEV_UNKNOWN;
 264                         break;
 265         }
 266
 267         ap->cbl = ATA_CBL_SATA;
 268 }
 269
 270 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 271 {
 272         if (qc->flags & ATA_QCFLAG_FAILED)
 273                 qc->err_mask |= AC_ERR_OTHER;
 274
 275         if (qc->err_mask) {
 276                 /*
 277                  * Find the sas_task and kill it.  By this point,
 278                  * libata has decided to kill the qc, so we needn't
 279                  * bother with sas_ata_task_done.  But we still
 280                  * ought to abort the task.
 281                  */
 282                 struct sas_task *task = qc->lldd_task;
 283                 unsigned long flags;
 284
 285                 qc->lldd_task = NULL;
 286                 if (task) {
 287                         /* Should this be a AT(API) device reset? */
 288                         spin_lock_irqsave(&task->task_state_lock, flags);
 289                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 290                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 291
 292                         task->uldd_task = NULL;
 293                         __sas_task_abort(task);
 294                 }
 295         }
 296 }
 297
 298 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
 299                               u32 val)
 300 {
 301         struct domain_device *dev = link->ap->private_data;
 302
 303         SAS_DPRINTK("STUB %s\n", __func__);
 304         switch (sc_reg_in) {
 305                 case SCR_STATUS:
 306                         dev->sata_dev.sstatus = val;
 307                         break;
 308                 case SCR_CONTROL:
 309                         dev->sata_dev.scontrol = val;
 310                         break;
 311                 case SCR_ERROR:
 312                         dev->sata_dev.serror = val;
 313                         break;
 314                 case SCR_ACTIVE:
 315                         dev->sata_dev.ap->link.sactive = val;
 316                         break;
 317                 default:
 318                         return -EINVAL;
 319         }
 320         return 0;
 321 }
 322
 323 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
 324                             u32 *val)
 325 {
 326         struct domain_device *dev = link->ap->private_data;
 327
 328         SAS_DPRINTK("STUB %s\n", __func__);
 329         switch (sc_reg_in) {
 330                 case SCR_STATUS:
 331                         *val = dev->sata_dev.sstatus;
 332                         return 0;
 333                 case SCR_CONTROL:
 334                         *val = dev->sata_dev.scontrol;
 335                         return 0;
 336                 case SCR_ERROR:
 337                         *val = dev->sata_dev.serror;
 338                         return 0;
 339                 case SCR_ACTIVE:
 340                         *val = dev->sata_dev.ap->link.sactive;
 341                         return 0;
 342                 default:
 343                         return -EINVAL;
 344         }
 345 }
 346
 347 static struct ata_port_operations sas_sata_ops = {
 348         .phy_reset              = sas_ata_phy_reset,
 349         .post_internal_cmd      = sas_ata_post_internal,
 350         .qc_prep                = ata_noop_qc_prep,
 351         .qc_issue               = sas_ata_qc_issue,
 352         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 353         .port_start             = ata_sas_port_start,
 354         .port_stop              = ata_sas_port_stop,
 355         .scr_read               = sas_ata_scr_read,
 356         .scr_write              = sas_ata_scr_write
 357 };
 358
 359 static struct ata_port_info sata_port_info = {
 360         .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
 361                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 362         .pio_mask = 0x1f, /* PIO0-4 */
 363         .mwdma_mask = 0x07, /* MWDMA0-2 */
 364         .udma_mask = ATA_UDMA6,
 365         .port_ops = &sas_sata_ops
 366 };
 367
 368 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 369                                struct scsi_target *starget)
 370 {
 371         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 372         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 373         struct ata_port *ap;
 374
 375         ata_host_init(&found_dev->sata_dev.ata_host,
 376                       ha->dev,
 377                       sata_port_info.flags,
 378                       &sas_sata_ops);
 379         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 380                                 &sata_port_info,
 381                                 shost);
 382         if (!ap) {
 383                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 384                 return -ENODEV;
 385         }
 386
 387         ap->private_data = found_dev;
 388         ap->cbl = ATA_CBL_SATA;
 389         ap->scsi_host = shost;
 390         found_dev->sata_dev.ap = ap;
 391
 392         return 0;
 393 }
 394
 395 void sas_ata_task_abort(struct sas_task *task)
 396 {
 397         struct ata_queued_cmd *qc = task->uldd_task;
 398         struct completion *waiting;
 399
 400         /* Bounce SCSI-initiated commands to the SCSI EH */
 401         if (qc->scsicmd) {
 402                 blk_abort_request(qc->scsicmd->request);
 403                 scsi_schedule_eh(qc->scsicmd->device->host);
 404                 return;
 405         }
 406
 407         /* Internal command, fake a timeout and complete. */
 408         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 409         qc->flags |= ATA_QCFLAG_FAILED;
 410         qc->err_mask |= AC_ERR_TIMEOUT;
 411         waiting = qc->private_data;
 412         complete(waiting);
 413 }
 414
 415 static void sas_task_timedout(unsigned long _task)
 416 {
 417         struct sas_task *task = (void *) _task;
 418         unsigned long flags;
 419
 420         spin_lock_irqsave(&task->task_state_lock, flags);
 421         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 422                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 423         spin_unlock_irqrestore(&task->task_state_lock, flags);
 424
 425         complete(&task->completion);
 426 }
 427
 428 static void sas_disc_task_done(struct sas_task *task)
 429 {
 430         if (!del_timer(&task->timer))
 431                 return;
 432         complete(&task->completion);
 433 }
 434
 435 #define SAS_DEV_TIMEOUT 10
 436
 437 /**
 438  * sas_execute_task -- Basic task processing for discovery
 439  * @task: the task to be executed
 440  * @buffer: pointer to buffer to do I/O
 441  * @size: size of @buffer
 442  * @dma_dir: DMA direction.  DMA_xxx
 443  */
 444 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
 445                             enum dma_data_direction dma_dir)
 446 {
 447         int res = 0;
 448         struct scatterlist *scatter = NULL;
 449         struct task_status_struct *ts = &task->task_status;
 450         int num_scatter = 0;
 451         int retries = 0;
 452         struct sas_internal *i =
 453                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 454
 455         if (dma_dir != DMA_NONE) {
 456                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 457                 if (!scatter)
 458                         goto out;
 459
 460                 sg_init_one(scatter, buffer, size);
 461                 num_scatter = 1;
 462         }
 463
 464         task->task_proto = task->dev->tproto;
 465         task->scatter = scatter;
 466         task->num_scatter = num_scatter;
 467         task->total_xfer_len = size;
 468         task->data_dir = dma_dir;
 469         task->task_done = sas_disc_task_done;
 470         if (dma_dir != DMA_NONE &&
 471             sas_protocol_ata(task->task_proto)) {
 472                 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
 473                                                task->scatter,
 474                                                task->num_scatter,
 475                                                task->data_dir);
 476         }
 477
 478         for (retries = 0; retries < 5; retries++) {
 479                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 480                 init_completion(&task->completion);
 481
 482                 task->timer.data = (unsigned long) task;
 483                 task->timer.function = sas_task_timedout;
 484                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 485                 add_timer(&task->timer);
 486
 487                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 488                 if (res) {
 489                         del_timer(&task->timer);
 490                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 491                                     res);
 492                         goto ex_err;
 493                 }
 494                 wait_for_completion(&task->completion);
 495                 res = -ECOMM;
 496                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 497                         int res2;
 498                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 499                                     task->task_state_flags);
 500                         res2 = i->dft->lldd_abort_task(task);
 501                         SAS_DPRINTK("came back from abort task\n");
 502                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 503                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 504                                         continue; /* Retry the task */
 505                                 else
 506                                         goto ex_err;
 507                         }
 508                 }
 509                 if (task->task_status.stat == SAM_BUSY ||
 510                            task->task_status.stat == SAM_TASK_SET_FULL ||
 511                            task->task_status.stat == SAS_QUEUE_FULL) {
 512                         SAS_DPRINTK("task: q busy, sleeping...\n");
 513                         schedule_timeout_interruptible(HZ);
 514                 } else if (task->task_status.stat == SAM_CHECK_COND) {
 515                         struct scsi_sense_hdr shdr;
 516
 517                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 518                                                   &shdr)) {
 519                                 SAS_DPRINTK("couldn't normalize sense\n");
 520                                 continue;
 521                         }
 522                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 523                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 524                              shdr.ascq == 1)) {
 525                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 526                                             "powering up or not ready yet, "
 527                                             "sleeping...\n",
 528                                             SAS_ADDR(task->dev->sas_addr),
 529                                             SAS_ADDR(task->ssp_task.LUN));
 530
 531                                 schedule_timeout_interruptible(5*HZ);
 532                         } else if (shdr.sense_key == 1) {
 533                                 res = 0;
 534                                 break;
 535                         } else if (shdr.sense_key == 5) {
 536                                 break;
 537                         } else {
 538                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 539                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 540                                             "\n",
 541                                             SAS_ADDR(task->dev->sas_addr),
 542                                             SAS_ADDR(task->ssp_task.LUN),
 543                                             shdr.sense_key,
 544                                             shdr.asc, shdr.ascq);
 545                         }
 546                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 547                            task->task_status.stat != SAM_GOOD) {
 548                         SAS_DPRINTK("task finished with resp:0x%x, "
 549                                     "stat:0x%x\n",
 550                                     task->task_status.resp,
 551                                     task->task_status.stat);
 552                         goto ex_err;
 553                 } else {
 554                         res = 0;
 555                         break;
 556                 }
 557         }
 558 ex_err:
 559         if (dma_dir != DMA_NONE) {
 560                 if (sas_protocol_ata(task->task_proto))
 561                         dma_unmap_sg(task->dev->port->ha->dev,
 562                                      task->scatter, task->num_scatter,
 563                                      task->data_dir);
 564                 kfree(scatter);
 565         }
 566 out:
 567         return res;
 568 }
 569
 570 /* ---------- SATA ---------- */
 571
 572 static void sas_get_ata_command_set(struct domain_device *dev)
 573 {
 574         struct dev_to_host_fis *fis =
 575                 (struct dev_to_host_fis *) dev->frame_rcvd;
 576
 577         if ((fis->sector_count == 1 && /* ATA */
 578              fis->lbal         == 1 &&
 579              fis->lbam         == 0 &&
 580              fis->lbah         == 0 &&
 581              fis->device       == 0)
 582             ||
 583             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 584              fis->lbal         == 0 &&
 585              fis->lbam         == 0xCE &&
 586              fis->lbah         == 0xAA &&
 587              (fis->device & ~0x10) == 0))
 588
 589                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 590
 591         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 592                   fis->lbal             == 1 &&
 593                   fis->byte_count_low   == 0x14 &&
 594                   fis->byte_count_high  == 0xEB &&
 595                   (fis->device & ~0x10) == 0))
 596
 597                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 598
 599         else if ((fis->sector_count == 1 && /* SEMB */
 600                   fis->lbal         == 1 &&
 601                   fis->lbam         == 0x3C &&
 602                   fis->lbah         == 0xC3 &&
 603                   fis->device       == 0)
 604                 ||
 605                  (fis->interrupt_reason == 1 && /* SATA PM */
 606                   fis->lbal             == 1 &&
 607                   fis->byte_count_low   == 0x69 &&
 608                   fis->byte_count_high  == 0x96 &&
 609                   (fis->device & ~0x10) == 0))
 610
 611                 /* Treat it as a superset? */
 612                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 613 }
 614
 615 /**
 616  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 617  * @dev: the device to send the command to
 618  * @command: the command register
 619  * @features: the features register
 620  * @buffer: pointer to buffer to do I/O
 621  * @size: size of @buffer
 622  * @dma_dir: DMA direction.  DMA_xxx
 623  */
 624 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 625                              u8 features, void *buffer, int size,
 626                              enum dma_data_direction dma_dir)
 627 {
 628         int res = 0;
 629         struct sas_task *task;
 630         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 631                 &dev->frame_rcvd[0];
 632
 633         res = -ENOMEM;
 634         task = sas_alloc_task(GFP_KERNEL);
 635         if (!task)
 636                 goto out;
 637
 638         task->dev = dev;
 639
 640         task->ata_task.fis.fis_type = 0x27;
 641         task->ata_task.fis.command = command;
 642         task->ata_task.fis.features = features;
 643         task->ata_task.fis.device = d2h_fis->device;
 644         task->ata_task.retry_count = 1;
 645
 646         res = sas_execute_task(task, buffer, size, dma_dir);
 647
 648         sas_free_task(task);
 649 out:
 650         return res;
 651 }
 652
 653 #define ATA_IDENTIFY_DEV         0xEC
 654 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 655 #define ATA_SET_FEATURES         0xEF
 656 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 657
 658 /**
 659  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 660  * @dev: STP/SATA device of interest (ATA/ATAPI)
 661  *
 662  * The LLDD has already been notified of this device, so that we can
 663  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 664  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 665  * performance for this device.
 666  */
 667 static int sas_discover_sata_dev(struct domain_device *dev)
 668 {
 669         int     res;
 670         __le16  *identify_x;
 671         u8      command;
 672
 673         identify_x = kzalloc(512, GFP_KERNEL);
 674         if (!identify_x)
 675                 return -ENOMEM;
 676
 677         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 678                 dev->sata_dev.identify_device = identify_x;
 679                 command = ATA_IDENTIFY_DEV;
 680         } else {
 681                 dev->sata_dev.identify_packet_device = identify_x;
 682                 command = ATA_IDENTIFY_PACKET_DEV;
 683         }
 684
 685         res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 686                                 DMA_FROM_DEVICE);
 687         if (res)
 688                 goto out_err;
 689
 690         /* lives on the media? */
 691         if (le16_to_cpu(identify_x[0]) & 4) {
 692                 /* incomplete response */
 693                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 694                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 695                 if (!(identify_x[83] & cpu_to_le16(1<<6)))
 696                         goto cont1;
 697                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 698                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 699                                         NULL, 0, DMA_NONE);
 700                 if (res)
 701                         goto cont1;
 702
 703                 schedule_timeout_interruptible(5*HZ); /* More time? */
 704                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 705                                         DMA_FROM_DEVICE);
 706                 if (res)
 707                         goto out_err;
 708         }
 709 cont1:
 710         /* XXX Hint: register this SATA device with SATL.
 711            When this returns, dev->sata_dev->lu is alive and
 712            present.
 713         sas_satl_register_dev(dev);
 714         */
 715
 716         sas_fill_in_rphy(dev, dev->rphy);
 717
 718         return 0;
 719 out_err:
 720         dev->sata_dev.identify_packet_device = NULL;
 721         dev->sata_dev.identify_device = NULL;
 722         kfree(identify_x);
 723         return res;
 724 }
 725
 726 static int sas_discover_sata_pm(struct domain_device *dev)
 727 {
 728         return -ENODEV;
 729 }
 730
 731 /**
 732  * sas_discover_sata -- discover an STP/SATA domain device
 733  * @dev: pointer to struct domain_device of interest
 734  *
 735  * First we notify the LLDD of this device, so we can send frames to
 736  * it.  Then depending on the type of device we call the appropriate
 737  * discover functions.  Once device discover is done, we notify the
 738  * LLDD so that it can fine-tune its parameters for the device, by
 739  * removing it and then adding it.  That is, the second time around,
 740  * the driver would have certain fields, that it is looking at, set.
 741  * Finally we initialize the kobj so that the device can be added to
 742  * the system at registration time.  Devices directly attached to a HA
 743  * port, have no parents.  All other devices do, and should have their
 744  * "parent" pointer set appropriately before calling this function.
 745  */
 746 int sas_discover_sata(struct domain_device *dev)
 747 {
 748         int res;
 749
 750         sas_get_ata_command_set(dev);
 751
 752         res = sas_notify_lldd_dev_found(dev);
 753         if (res)
 754                 return res;
 755
 756         switch (dev->dev_type) {
 757         case SATA_DEV:
 758                 res = sas_discover_sata_dev(dev);
 759                 break;
 760         case SATA_PM:
 761                 res = sas_discover_sata_pm(dev);
 762                 break;
 763         default:
 764                 break;
 765         }
 766         sas_notify_lldd_dev_gone(dev);
 767         if (!res) {
 768                 sas_notify_lldd_dev_found(dev);
 769                 res = sas_rphy_add(dev->rphy);
 770         }
 771
 772         return res;
 773 }